5,2: 28,6=y: 0,11 и 20,4/0,012=z/0,8

28,6у=5,2*0,11                            0,012z=20,4*0,8
28,6у=0,572                                0,012z=16,32
у=0,572:28,.6                                  z=16,32:0,012
у=0,02                                             z=1360